Headers that may be added to a Message
Examples of such headers would be Content-Type.
NOTE: The Content-Length header will be generated from the resulting Entity and thus should not be added.
Convert the type A to an EntityEncoder.Entity in the Task monad
Get the Charset of the body encoded by this EntityEncoder, if defined the headers
Get the org.http4s.headers.Content-Type of the body encoded by this EntityEncoder, if defined the headers
Make a new EntityEncoder using this type as a foundation
Generate a new EntityEncoder that will contain the Content-Type header